Statements of Financial Condition (Unaudited) (Parenthetical) - USD ($)	Mar. 31, 2021	Dec. 31, 2020
Investments in Securities, cost	$ 1,841,578,503	$ 1,290,438,251
US Treasury Bill Securities [Member]
Investments in Securities, cost	863,800,781	399,839,681
Affiliated Investments [Member]
Affiliated Investments, at Cost	$ 977,777,722	$ 890,598,570